20248639 has 2 divisors, whose sum is σ = 20248640. Its totient is φ = 20248638.

The previous prime is 20248637. The next prime is 20248687. The reversal of 20248639 is 93684202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20248639 - 2¹ = 20248637 is a prime.

Together with 20248637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20248637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10124319 + 10124320.

It is an arithmetic number, because the mean of its divisors is an integer number (10124320).

Almost surely, 2^20248639 is an apocalyptic number.

20248639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20248639 is an equidigital number, since it uses as much as digits as its factorization.

20248639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20248639 is about 4499.8487752368. The cubic root of 20248639 is about 272.5619823655.

It can be divided in two parts, 202 and 48639, that added together give a square (48841 = 221²).

The spelling of 20248639 in words is "twenty million, two hundred forty-eight thousand, six hundred thirty-nine".